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Firefox OS (sometimes abbreviated FxOS) is a new mobile operating system developed by Mozilla. It uses a Linux kernel and boots into a Gecko-based runtime engine, which lets users run applications developed entirely using HTML, JavaScript, and other open web application APIs.

Firefox OS is currently under heavy development; we are constantly working on ways to make it easier for you to use and hack on Gaia (the default set of apps) and create your own. However, you need knowledge about systems in order to do things like build the entire Firefox OS stack, or flash a phone with a build of Firefox OS. Linked below are guides meant for Web developers interested in running and making changes to Gaia or developing apps to run on Firefox OS devices.

Everything you need to know about writing and running automated tests for Firefox OS.

Firefox OS app design and development

For up-to-date information on Firefox OS App design and development, you should consult our Open Web Apps documentation center. Some other resources are listed below, but probably won't be for long, as they will be integrated into the main apps docs.